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Subject: Re: Automatic Eval Tuning

Author: Vincent Diepeveen

Date: 08:18:48 06/29/01

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On June 29, 2001 at 11:14:34, Artem Pyatakov wrote:

>I am curious, have people here experimented or extensively used Eval Function
>tuning based on GM games for example?
>
>If so, is it effective to any extent?
>
>I came across this page and it seemed kind of interesting:
>http://www.tim-mann.org/DT_eval_tune.txt
>
>Have others tried this too?
>
>Thanks in advance.

yes i tried some years ago automatic tuning.

The bigger your evaluation is, the more problematic tuning it automatic
is. Also automatic tuners don't have any chess knowledge, so they
don't see the difference between tuning passed pawns negative if you happen
to have a testset where a passer is bad now and then.

Another problem for automatic tuners is that you tune for testposition set X,
but that in reality it has to work well also for testset Y where it has
not been tuned for.

Evaluations hand tuned take into account testset Y, not only testset X.

Anyway, when your number of parameters gets quite a big number then
automatic tuning doesn't work anyway anymore.

Of course it might beat random chosen parameters, but it'll never beat
hand chosen parameters (unless a fool choses them).

Best regards,
Vincent



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